Takeshi Yamashiro

Natsu no Arashi! (夏のあらし!?, lit. Summer Storm!) is a Japanese manga written and illustrated by Jin Kobayashi, who is known for his previous work School Rumble. The manga started serialization in Square Enix's Gangan Wing shōnen manga magazine on August 25, 2006, and seven bound volumes have been released in Japan as of March 2010. The anime adaption began broadcasting on April 5, 2009. A second series has been made that is called Natsu no Arashi! Akinai-chū The complete first series of the anime is available to watch at crunchyroll.com

Thirteen-year-old Yasaka is a boy staying at his grandfather's house during his summer vacation. One day he entered a store and met Arashi, a beautiful sixteen-year old girl working there. After trying to protect her from a man who claims to have been hired by her family to take her back by force, Yasaka ran away with her and now she stays at his grandpa's place with him. It didn't take much time for Yasaka to figure out that his new friend is far from an ordinary girl, as she possesses mysterious powers. The plot thickens when he finds a sixty-year-old picture of Arashi and another girl named Kaja, and to the surprise of all Kaja suddenly appears, and just like Arashi, her appearance hasn't changed at all since then.

Two other characters introduced so far are the place's owner, a woman whose name is still unrevealed and rumored to be a high level con artist, and Jun Kamigamo, a student of Yasaka's age who he met at the store, and works there with him since then. Despite being a girl, she keeps dressing and addressing herself as a boy to the other characters. So far only Kaja and Arashi know her secret.

The main male protagonist. A 13 year-old boy who is spending his summer vacation in his grandfather's house. When he met Arashi from the first time, he established a connection with her when he touched her hand, and since then the duo gained the power to travel back and forth in time. He is infatuated with Arashi's beauty and kindness, but is afraid to convey his feelings to her.

The main female protagonist. Despite still looking like a beautiful sixteen years-old girl, Arashi is in fact a ghost who lived during World War II times. Since then her mission had been traveling back in time to rescue those in her community from air-raids by American warplanes. However, to travel back to the past, she must do it accompanied by a living person from the present with whom she made a "connection". Her relationship with Hajime is a bit more complicated than it seems. In the second season it's revealed that Arashi's first love was a time-tripping Hajime.